Digestive system anus

The anus is the opening at the far end of the digestive tract through which stool leaves the body. The anus is formed partly from the surface layers of the body.

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The article provides an overview of the digestive system, which a brief description of the body part components from the top (the mouth) to the bottom (the anus).

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Description:Rectum and anus The rectum , which is a continuation of the sigmoid colon , begins in front of the midsacrum the sacrum is the triangular bone near the base of the spine and between the two hipbones. It ends in a dilated portion called the rectal ampulla, which in front is in contact with the rear surface of the prostate in the male and with the posterior vaginal wall in the female. Posteriorly, the rectal ampulla is in front of the tip of the coccyx the small bone at the very base of the spine. At the end of the pelvic colon, the mesocolon, the fold of peritoneum that attaches the colon to the rear wall of the abdomen and pelvis, ceases, and the rectum is then covered by peritoneum only at its sides and in front; lower down, the rectum gradually loses the covering on its sides until only the front is covered. Near the termination of the sigmoid colon and the beginning of the rectum, the colonic taeniae spread out to form a wide external longitudinal muscle coat. At the lower end of the rectum, muscle fibres of the longitudinal and circular coats tend to intermix.

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